Questions tagged [power]

Power is the ability to supply a device with energy. This question covers how to power the Pi, ways to do it, and the safe ranges of power.

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Can a Raspberry Pi 4 power an external HD?

I was not able to power an external HD directly from a Raspberry pi 3 (the HD was constantly complaining about a lack of power). Would a Raspberry Pi 4 be able to power a portable hard drive (using ...
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USB Power Draw Plug In Order

I'm having some issues running a USB webcam and a USB speaker at the same time. If I plug in my webcam second, both devices work perfectly fine. If I simply boot with both plugged in, the speaker ...
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RaspberryPi turns on but wont start

So I come home and the power strip in which I left the RaspberryPi has tripped and it was off. I restart it, but I notice that the RaspberryPi wasn't giving any output when I plugged the monitor in. I ...
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Prevent under-voltage warnings from printing to the console

My Pi occasionally experiences an undervoltage for a second. I am working on fixing it but my main concern is that my Pi is being used in a kiosk application that displays a text output to the ...
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2answers
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The best way to connect the 7” touchscreen

I have a pi 3 model B+ and the official raspberry Pi PSU, and the official 7” touch screen. I’m running Raspbian with all the latest updates. I have connected the display using a USB cable as ...
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About Power supply for Pi 4b [duplicate]

I have bought Pi 4b but now I don't wanna buy separate power adapter for it, I already have 5V,4A power adapter of my smartphone so can I use it for Pi 4b also??
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1answer
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Will this work out (usb hub + rpi zero w + Zishan Z1 DSD)?

Well, I want to connect Rpi zero W and Zishan Z1/2 DSD in one case, but with both devices working in one port connected to PC. (with working usb device in Rpi if in "portable" mode or in both ...
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Raspberry Pi Losing Power

I bought a Raspberry Pi that had the entire n64 library loaded onto it. it takes an HDMI cable to plug into the TV and has a regular USB to micro USB for the power. I start it up and it begins to boot ...
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Pi 3 w/Pisound - Won't turn on unless wait a few minutes

I have a Pi 3 and Pisound (hat) and to turn it off I just unplug the cable. Now oddly, if I plug it back in right away I just get a red light, no blinking yellow BUT If I wait a few minutes to plug it ...
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1answer
47 views

Does a battery pack exists which does not need the microUsb power connection? [closed]

I'm building a small robotic car, which obviously needs battery power for it and the RPi. I've no problem with the battery pack for the car since it fits neatly into the chassis, but the RPi microUsb ...
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Fast turn off of a Pi in embedded applications [duplicate]

Is there any documentation about what the Pi is actually doing during its (excruitatingly) slow power down ? I want to build a Pi4 into a product that will definitely have the power cord pulled on a ...
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1answer
201 views

Raspberry Pi 4 not turning off HDMI monitor on idle

In the past, the Raspberry Pi computers could be made to turn off the monitor (as opposed to leaving the backlight on with a blank screen) when the Pi turned the screen off on inactivity. This could ...
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1answer
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Using Both +5V GPIO Pins for More Current?

According to this website: https://pinout.xyz/pinout/pin2_5v_power# The +5V GPIO pins can push up to 1.5A of current, and are attached directly to the Pi's power supply. My question is, if I use ...
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power supply for multiple raspberry pi4

I am wondering if any one knows of a power supply that will power 4 or more raspberry pi4 with the type C plug? (Yes I would like the full 3 amps or more) I thought of a standard ATX power supply, ...
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Voltage drop when RaspberryPi boots

Im trying to learn robotics with raspberrypi but im having a problem. I have 6 AA batteries in a batteryholder that are connected to a breadboard and with M-M jumping wires its connected to a LM2596S ...
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1answer
47 views

Allow more power for USB Devices?

Is there a way to allow more power to USB Devices powered by the Pi I have a model B+, and I am unable to power my Webcam plugged into the Pi it has a single USB Connection so there's no way to power ...
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1answer
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Help with the logistics of powering a raspberry pi emulation box

Firstly, I'm unsure if this belongs here or in electrical engineering, but I decided on here incase anyone else has attempted a similar thing. I've had a raspberry pi and an old wooden chest lying ...
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Are there any battery backup options that work with a PoE powered Pi?

Looking to have a Pi (4) that is powered over PoE - are there any battery backup options (i.e. hats) that can be stacked with the PoE hat & supply power if/when the PoE fails (and then re-charge ...
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1answer
71 views

Battery Usage Pi Zero W for video stream

I am trying to do live video streaming from the rasberry pi, meaning the camera is recording a video and then transmitting the live video over wifi. What is the smallest battery I can use to power ...
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49 views

Test raspberry power supply

I have a raspberry pi 3 B+ and an external hdd like this one Connecting it directly to the pi makes the pi shutdown and restart I’ve tried to use an external usb hub with power but it still keeps ...
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1answer
75 views

Raspberry Pi does not reboot with powered external HDD attached

I have recently set up a Plex Media Server on a new Raspberry Pi 4 (4 Gb). This is powered using it's own official power supply, the Pi is connected via USB to a powered USB hub which has a 1TB WD ...
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RPi 3 - Reduce power consumption

I am looking to reduce the power consumption to a minimum on my RPi 3. For my project, the Raspberry Pi Zero is not an option. for now, I disabled Bluetooth and WiFi and made sure to kill some ...
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1answer
48 views

Raspberry Pi 3 b+ seemed to be dead because of excessive vlotage of around 5.5 volts. Can anybody help?

My rapsberry pi 3 b+ constantly showed the under-voltage warning, so I connected my PSU to th RPI and setted the output voltage to be around 5.5v. I measured a voltage of around 5.2v when the RPI was ...
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Powering a raspberry pi 4 using a micro usb power supply with adapters

I previously owned a raspberry pi model 3b+ and have purchased a new raspberry pi 4b (4 gigabyte ram). I have an official micro USB power supply and some micro USB to USB type C converters designed to ...
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388 views

Can the 3b+ power two usb SSD drives?

Can I power two usb drives using USB to satas or do i need a powered USB hub?
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138 views

Raspberry pi 3B+ won't boot, solid red light

My Pi won't boot, I was coding my Pi when my friend came and wanted to see a movie from the Pi, I shut it down normally and close the power supply, then changed the SD card that had kodi on and tried ...
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How can I mount a speaker on to a Pi so that it is light enough for it to be mobile

Can I mount a speaker on a mobile Pi robot together with a suitable power supply? Ideally I’d like the Pi to follow a fixed route while emitting a fixed repeating tone.
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No activity LED after shorting a GPIO to ground : dead or fixable?

This is a model 3B+, due to some under-power warnings on the screen I was testing the actual voltage between the 5V and ground pins on the header, but managed to touch pin 40 (SCLK) to pin 39 (GND) ...
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2answers
102 views

What happens to the GPIO voltage after shutdown?

I don't have a Raspberry Pi laying around at the moment and I would like to detect if my Raspberry Pi is shuted down. My Idea is that maybe after the Pi shutted down the Voltage at the 3V3 pin will ...
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1answer
65 views

I think I fried my Raspberry Pi, but I'm not sure

I was making connections from my Raspberry Pi to a relay module. While I was running some sample code, I noticed that after I had terminated the program I was still getting a high CPU usage (around 60%...
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5answers
2k views

Choosing a Pi4 power supply

I'm trying to decide what is the best option for powering a Pi4. The specs mention for a minimum of 3A. Let's consider we would also like to connect a 2.5" drive to the Pi4. Could someone more ...
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HDMI power circuit on the Raspberry Pi 4

The previous models of the Raspberry Pi used different circuits to connect its 5 V power rail to the HDMI connector, i.e. How much current can I draw from each model's HDMI socket? Especially the ...
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1answer
1k views

Powering the Pi 4 - safe voltage levels and current requirements

How to safely power the Pi 4, more specifically: What voltage levels are safe to power the Pi 4 via the USB-C connector or via the GPIO header? What are the current requirements? What Power ...
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1answer
39 views

Power on a machine by pressing a physical button

There is a machine which usually runs in standby mode, and the only way to wake it up is by pressing a physical button with a small force and then quickly release. I want to remotely push the button ...
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8answers
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What is the highest voltage from the power supply a Raspberry Pi 3 B can handle without getting damaged?

I am using Android things on Raspberry Pi 3 B with a 7-inch touch screen. Currently, I always see a yellow thunder bolt sign on the screen which means that the Raspberry Pi isn't receiving a high ...
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2answers
141 views

Pin powered Pi crashes when servos move

I have been working on a circuit to power a Raspberry Pi and servo(s) from a single power source. The diagram below shows the basic configuration, although the 'AA battery' is actually two 18650s. ...
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2answers
64 views

Detect when the rpi3b+ has shut down

I have a pi in an embedded project. When the user turns the instrument off, I want to inhibit turning back on until the pi is done shutting down. I can do this with a timer circuit, but would like to ...
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2answers
69 views

Pi Remains Running When External (Powered) HD is connected

I have a Pi3B+. Attached is a (powered) Western Digital My Book external hard drive. When I accidentally unplugged the power to the Pi, it kept running, happy as can be with the only other energy ...
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1answer
32 views

Most recommended power-supply option from dual-port Powerbank

I have a Raspberry Pi 3 model B [1]. It's powered by a DC adapter that outputs 5.1V and 2.5A. Although I consider ocassional manual reboots, I'm planning to use a Powerbank as some kind of UPS, after ...
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1answer
57 views

SD card vs USB stick: best secondary storage for sudden shutdowns projects

I have a Raspberry Pi with Raspbian Raspbian Stretch Lite on a read-only SD card which periodically saves files on the secondary storage. Since there will be sudden shutdowns I'm wondering which ...
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1answer
108 views

Connecting Pi-Zero W to Adafruit Powerboost 1000 through Extension Header or USB

As the title states I want to power my pi-zero with an adafruit powerboost 1000. I have looked into ways to do this and it seems there are 2 possibilities: Use the USB output of the powerboost to ...
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When is the RPi safe to power down? [duplicate]

My RPi3B+ is an embedded front end for a scientific instrument. I have an interface PCB with a 3amp 5v regulator, driven by a 48v supply. I monitor the 48v with ADC polled each 100ms, then sudo ...
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98 views

Safely connect Adafruit's powerboost 1000C LBO to rPi-GPIO

I would like to connect Adafruit's powerboost 1000C LBO control pin to a rPi GPIO-pin. So I can gracefully shutdown my rPi when the LiPo runs low. I would like to connect the LBO to a diode to lower ...
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can low power be the cause of low WiFi speed?

I'm using a raspberry pi 2 model b running Ubuntu core, and a TP-Link TL-WN821Nv3 USB WiFi adapter, which has a maximum speed of 300mbps/37.5mBps, and a Samsung charger which supplies 2A (lower than ...
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2answers
840 views

Power LED from 3.3V Power Pin without Resistor

I tried wiring one white LED to the 3.3V pin on a Pi Zero W with a 330 Ohm resistor but it's not as bright as I would like. If I wire it up without a resister I get a good amount of brightness. Is ...
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measuring phase difference in 3 phase power

For my ceramics oven I had 3 phase power installed. But power consumption according to the meter is way higher than the nominal 7KW the oven consumes. A friend told me that if the phase (or sinus) is ...
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57 views

Connecting 4 WiFi USB Adapters to Raspberry Pi 3

I'm trying to get 4 Wifi adapters running off the Pi (overkill I know), the adapter in question is the Alfa Network AWUS036NHA, the Pi runs smoothly and reads the adapters as I plug them in one by one ...
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1answer
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Raspberry Pi Shows Low Power Lightning Bolt When Only Using 1 of 3 Amps

My Raspberry Pi 3B+ is running Kali Linux on the official 7" display. I am using an Anker power bank that says: "5V=6A (3A max per port)" in the description. When using the Pi, it constantly shows the ...
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Raspberry Shut down After trying to connect fan

I just bought a new Raspberry Pi 3B+ UK and was working with it for about 2 hours, and then when I was not at home, my son noticed that the CPU is hot and tried to cool it down with a normal 5V PC fan ...
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Reflective IR sensor Is not as sensitive as its designed to be

I'm working on a project where I'm repurposing sensors from a Pop-a-shot machine Sensors we're using https://www.popashot.net/shop/accessories/scoring-sensors/ The sensors are a 4 pin reflective IR ...